LDO59

LDO_59 IP Library: Ultra Low Noise, High PSRR, Low Power, 20mA Low Dropout Voltage Regulator PRODUCT PREVIEW s s s s s s s s s RF REGULATOR VERY LOW DROPOUT VOLTAGE : 60mV ULTRA LOW OUTPUT VOLTAGE NOISE HIGH PSRR : 70dB LOW QUIESCENT CURRENT : 70µA FULL LOAD NO CURRENT IN POWER DOWN MODE SHORT CIRCUIT PROTECTION SMALL DECOUPLING CERAMIC CAPACITOR MOS INPUT STAGE APPLICATION NOTE An external capacitor (COUT = 1 µF typical) with an equivalent serial resistance (ESR) in the range 0.02 to 0.6Ω is used to ensure stability. Figure 1 : Block Diagram IN ? ? OUT PWRDWN ? APPLICATIONS – Cellular and Cordless phones supplied by 1 cell Lithium-ion battery / 3 cells Ni-MH or Ni-Cd battery. – PDA (Personal Digital Assistant), Smart phone. – Portable equipment. – Supply for RF devices for cellular phone. Figure 2 : Typical Application Circuit IN OUT LDO_59 VREF VIN ? ? VOUT Power Down Mode PWRDWN ON 1µF ? LDO_59 ESR COUT OFF ? GND June 2002 This is advance information on a new product now in development or undergoing evaluation. Details are subject to change without notice. 1/4 LDO_59 ELECTRICAL CHARACTERISTICS 3V < VIN < 5.5V, -30°C < T < 125°C, 0.8 µF < COUT < 1.2µF, 20mΩ < ESR < 0.6Ω, 100µA < ILOAD < 20mA. Typical case : VIN = 4V, T = 25°C, IOUT = 10mA. Parameter Input Voltage Range (Note 1) Output Voltage Output Voltage Accuracy Output current PMOS Output Resistance Dropout Voltage ILOAD RON ∆VDO ∆VOUT = 50mV, ILOAD = 20mA (Note 2) Quiescent current IQ ILOAD = 100µA ILOAD = 20mA Power down mode quiescent current Power Supply Rejection Ratio IQPRWDWN PSRR Power down active DC to 10KHz f < 100KHz Load Regulation Line Regulation Line Transient Ldr Lir Lirt I LOAD = 20mA, VOUT = 2.8V VOUT = 2.8V, ILOAD = 20mA, ∆VIN = 300mV tRISE = tFALL = 10µs Load Transient Ldtr VOUT = 2.8V tFALL = tRISE = 10µs Recovery time Output Noise Voltage en VOUT = 2.8V 100Hz < f < 1KHz 1KHz < f < 100KHz Output decoupling capacitor Settling time (from power down to active mode) Short Circuit Current Limit ISHORT COUT VOUT = 2.8V, COUT = 1.2µF 1 20 50 200 60 0,3 4 160 1 6 200 nV ----------Hz µF µs mA mV µs 0,5 1 mV 55 40 170 50 70 100 70 50 6 0,5 9 1 mV mV 70 150 µA µA nA dB Symbol VIN VOUT Test Condition Min 3 2,8 3 20 0,6 60 Typ Max 5,5 Unit V V % mA Ω mV Notes: 1. Above characteristics are given for 3V minimum input operating range voltage, but regulator is operational with 2.7V minimum input voltage. 2. All parameters are guaranteed with 170mV min dropout voltage. 2/4 LDO_59 TYPCIAL CHARACTERISTICS Figure 3 : Line transient (rising edge) Figure 4 : Line transient (falling edge) Figure 5 : Load transient (rising edge) Figure 6 : Load transient (falling edge) Figure 7 : Settling time Figure 8 : PSRR vs Frequency (ILOAD = 20mA ; VINmin) 70 65 PSRR (dB) 60 55 50 100 1000 10000 100000 Frequency (Hz) 3/4 LDO_59 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics © 2002 STMicroelectronics - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom - United States http://www.st.com 4/4